add: readme

README.md

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+Prototype.
+- linux only (uses `/tmp/`)
+
+Download:
+- downloads either today or 2022-05-08 if today is unavailable
+- crashes if most recent hour does not have files yet (it is chehcked but fallback is not implemented)
+- prediction_time is hardcoded to 4
+
+Data:
+- returns data PER DOT (and in 20 seconds)
+-  opens the file like 10 times
+- latest hour is hardcoded to 18
+
+
+# Usage
+```
+uvicorn main:app --reload
+```
+
+```
+curl http://127.0.0.1:8000/download/ 
+curl 'http://127.0.0.1:8000/weather_dot/?lat=75&lon=0&prediction_time=004'
+```